The Pin-Rivet, cataloged under National Stock Number 5320-01-591-0123, is classified within Federal Supply Class 5320 (Rivets) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5320-01-591-0123 |
| Primary Part Number | HL645-12-20 |
| Item Name | Pin-Rivet |
| FSC / FSG | 5320 / 53 — Rivets |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Shank Diameter | 0.373 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN |
| Lubrication | SOLID FILM |
| Fastener Length | 1.785 INCHES MINIMUM AND 1.805 INCHES MAXIMUM IN |
| Head Style | FLUSH COUNTERSUNK |
| Nominal Thread Size | 0.375 INCHES IN |
| Grip Length | 1.245 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN |
| Width Between Flats | 0.158 INCHES MINIMUM AND 0.161 INCHES MAXIMUM IN |
| Shank Style | PIN-RIVET, STRAIGHT, THREADED |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Head Major Diameter | 0.555 INCHES MINIMUM AND 0.560 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| HL645-12-20 | West Coast Aerospace, Inc. (USA) |
| HL645-12-20 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| HL645-12-20 PRIMARY | Hi-Shear Corporation (USA) |
| HL645-12-20 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| HL645-12-20 | Huck International, Inc (USA) |
| HL645-12-20 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| HL645-12-20 | Howmet Global Fastening Systems Inc (USA) |
| HL645-12-20 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| HL645-12-20 | 5/2 Secondary reference U.S. Government activity |
NSN 5320-01-591-0123 is a Pin-Rivet, manufactured by Hi-Shear Corporation, classified under FSC 5320, Rivets. Status: active.
NSN 5320-01-591-0123 has 8 manufacturer part numbers on file: HL645-12-20 (West Coast Aerospace, Inc.), HL645-12-20 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), HL645-12-20 (Hi-Shear Corporation), HL645-12-20 (Sps Technologies Ltd, Tj Brooks Division), HL645-12-20 (Huck International, Inc) and 3 more.
Key specifications for HL645-12-20: Shank Diameter: 0.373 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN; Lubrication: SOLID FILM; Fastener Length: 1.785 INCHES MINIMUM AND 1.805 INCHES MAXIMUM IN; Head Style: FLUSH COUNTERSUNK. 14 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.